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In den Warenkorbpaperback. Zustand: Good. Paperback. Pub Date :1979-05 Pages: 369 Publisher: Heilongjiang People's Publishing House sheets: 11.75.
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In den Warenkorbpaperback. Zustand: New. Language:Chinese.Paperback. Pub Date: 2021-08-01 Pages: 248 Publisher: China Railway Publishing House tunnel boring smooth blasting has two major problems in the past: one is that the light blasting blastholes are arranged too densely. the boreholes are too much. and the boreholes take too long. Long. prolonging the drilling and blasting operation time. affecting the construction progress; second. over-under-excavation often occurs. especially over-excavation is more serious. increasing const.